Swollen feet in ninety-year-olds are most commonly associated with functional disorders, such as heart failure, renal failure, and systemic hypoproteinemia. All three of these conditions can be treated with diuretics to diuretize and reduce swelling. Furosemide, anisodone or mannitol are commonly used for dehydration and diuresis to reduce swelling. However, if the underlying cause is treated, renal failure can be given to do hemodialysis to solve the problem of renal failure. If it is cardiac failure, cardiotonic treatment must be given, commonly used cardiotonic drugs are digoxin or intravenous push of cetiran. If hypoproteinemia causes swelling of the feet, protein must usually be supplemented, and the best way to do this is with an albumin infusion.